In a collision between two balls like a basketball and a soccer ball, the outcomes depend on their masses and the initial speeds.
The basketball is typically heavier than a soccer ball. When Marla rolls the basketball toward the soccer ball, the basketball's higher mass means it will transfer some of its momentum to the soccer ball upon collision.
Considering this:
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If the basketball comes to a stop after colliding with the soccer ball, then the soccer ball will move forward. However, while it will be moving forward, it is unlikely that it will achieve a greater speed than the initial speed of the basketball because of conservation of momentum.
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If both balls move forward post-collision, it's consistent with the momentum transfer. Since the basketball has greater mass, it would likely have less speed after the collision compared to before.
Taking all this into consideration, the most fitting response is:
After the collision, both balls move in the same forward direction. The basketball has less speed than the soccer ball.